阅读说明：本技术 充装枪用手阀组件及充装枪 (Hand valve component for filling gun and filling gun ) 是由 王志辉 吴京祥 于 2021-08-05 设计创作，主要内容包括：本发明实施例公开的一种充装枪用手阀组件,包括：阀体,具有阀杆腔、出气通道和进气通道；阀杆,可移动地设置于所述阀杆腔内,以切换所述出气通道和所述进气通道的通断；静密封件,用于密封所述阀体和所述阀杆之间的间隙,至少包括套设于所述阀杆上的波纹管,所述波纹管的一端与所述阀杆密封连接,另一端与所述阀体密封连接。本发明提供的充装枪用手阀组件,通过静密封件实现阀体和阀杆之间的密封,密封可靠性更高,增加了密封件的使用寿命。本发明实施例还公开了一种充装枪。(The embodiment of the invention discloses a valve component for a filling gun, which comprises: the valve body is provided with a valve rod cavity, an air outlet channel and an air inlet channel; the valve rod is movably arranged in the valve rod cavity so as to switch the on-off of the air outlet channel and the air inlet channel; the static sealing element is used for sealing a gap between the valve body and the valve rod and at least comprises a corrugated pipe sleeved on the valve rod, one end of the corrugated pipe is in sealing connection with the valve rod, and the other end of the corrugated pipe is in sealing connection with the valve body. The hand valve assembly for the filling gun provided by the invention realizes sealing between the valve body and the valve rod through the static sealing element, has higher sealing reliability and prolongs the service life of the sealing element. The embodiment of the invention also discloses a filling gun.)

1. A hand valve assembly for a filling gun, comprising:

a valve body (110) having a stem cavity (118), an outlet passage (115), and an inlet passage (113);

the valve rod (120) is movably arranged in the valve rod cavity (118) to switch the air outlet channel (115) and the air inlet channel (113) on and off;

the static sealing element is used for sealing a gap between the valve body (110) and the valve rod (120), and at least comprises a corrugated pipe (109) sleeved on the valve rod (120), one end of the corrugated pipe (109) is in sealing connection with the valve rod (120), and the other end of the corrugated pipe is in sealing connection with the valve body (110).

2. Valve assembly for a filling gun according to claim 1, wherein the static seal further comprises a first sealing gasket (106) and a pressing piece, the first sealing gasket (106) being fixed to the valve body (110) by the pressing piece, the bellows (109) being sealingly connected to the pressing piece so as to be sealingly connected to the valve body (110) by the pressing piece and the first sealing gasket (106).

3. The hand valve assembly for a filling gun of claim 2, wherein the pressing piece comprises:

the flange (108) is sleeved on the valve rod (120), is connected with the corrugated pipe (109) in a sealing mode, and compresses the first sealing gasket (106);

a press cap (103) in threaded engagement with the valve body (110);

and the pressing piece is arranged in the valve rod cavity (118), one end of the pressing piece is abutted against the pressing cap (103), and the other end of the pressing piece is abutted against the flange (108) so as to press the flange (108) against the first sealing gasket (106).

4. Valve assembly for a filling gun according to claim 3, characterized in that the bellows (109) is a metal bellows and is sealingly connected to the valve stem (120) and the flange (108), respectively, by welding.

5. Valve assembly for a filling gun according to claim 4, characterized in that the inner wall of the valve stem cavity (118) is provided with a first stop step (119), and the first sealing gasket (106) is positioned on one side at the first stop step (119) and on the other side in abutment with the flange (108).

6. The hand valve assembly for filling gun according to claim 4, characterized in that the valve stem (120) is connected with a wrench (102) extending outside the pressing cap (103), the wrench (102) is connected with the valve stem (120) through a wrench stem (101), the wrench stem (101) is in threaded connection with the pressing cap (103), and the wrench (102) is rotated to drive the valve stem (120) to move linearly along the valve stem cavity (118).

7. The valve assembly for the filling gun as recited in claim 2, wherein an installation caulking groove is formed at the end of the valve rod (120) close to one end of the air outlet channel (115), a second sealing gasket (107) is arranged in the installation caulking groove, and the second sealing gasket (107) is abutted against and separated from the valve body (110) so as to switch the on-off of the air outlet channel (115) and the air inlet channel (113).

8. The hand valve assembly for filling gun according to claim 7, characterized in that the air outlet channel (115) and the air inlet channel (113) are both communicated with the valve rod cavity (118), and the second sealing gasket (107) is abutted against and separated from the valve body (110) to switch on and off one of the air outlet channel (115) and the air inlet channel (113) and the valve rod cavity (118).

9. The hand valve assembly for filling gun according to claim 8, characterized in that the outer wall of the air outlet channel (115) is formed with a sealing surface (117) extending into the valve stem cavity (118), and the second sealing gasket (107) is used for abutting against and separating from the sealing surface (117) to switch the opening and closing of the air outlet channel (115) and the valve stem cavity (118).

10. The valve assembly for a gun according to claim 7, wherein the air inlet passage (113) is opened with an internally threaded hole (114) penetrating an end of the valve body (110) and connecting with the inner gun tube (20).

11. The hand valve assembly for filling gun according to claim 10, characterized in that the end of the internally threaded hole (114) close to the air inlet channel (113) is provided with a stop step (116), and the stop step (116) is provided with a third sealing gasket (112).

12. Valve assembly for a filling gun according to claim 11, wherein the first gasket (106), the second gasket (107) and the third gasket (112) are all corrosion and pressure resistant gaskets.

13. Valve assembly for a filling gun according to claim 12, characterized in that the first gasket (106), the second gasket (107) and the third gasket (112) are teflon or nylon gaskets.

14. A filling gun comprising a gun body (50), an inner gun tube (20) and a filling gun hand valve assembly in communication with the inner gun tube (20), characterized in that the filling gun hand valve assembly is a filling gun hand valve assembly according to any one of claims 1-13.

15. Filling gun according to claim 14, characterized in that the air inlet channel (113) of the hand valve assembly for the filling gun communicates with the inner barrel (20), and the air outlet channel (115) forms a head (111) of the gun opposite the gun body (50).

16. Filling gun according to claim 15, characterized in that the tip (111) is externally coated with a rubber-elastic tip cup (121).

Technical Field

The invention relates to the technical field of filling guns, in particular to a hand valve assembly for a filling gun and the filling gun.

Background

Along with social development, the application of pressure gas is more and more common, and liquefied gas, coal gas, oxygen, nitrogen, hydrogen and the like play more and more important roles in national life. The pressurized gas is generally contained in a gas cylinder, exists in a gaseous state or a gas-liquid two-phase state, and is filled through a filling gun. It is known that a considerable portion of the pressurized gas is corrosive, some flammable, and some explosive. Traditional filling gun adopts sealing washer and elastic sealing pad to realize sealed, and at the in-process of filling pressure gas, can lead to the change of the physical and chemical properties of a certain degree of tight sealing material, leads to life ratio weak point, and customer experience is relatively poor.

As shown in fig. 1, a filling gun in the prior art is composed of a gun main body 5, a gun handle 6, a valve assembly 1 for the filling gun, an inner gun tube 2, a gun body 3, a gun head 4 and the like, wherein the valve assembly 1 for the filling gun is installed at the rear end of the filling gun, and a cylinder valve is clamped with the gun main body 5 through the gun head 4, so that the gun head 4 is communicated with the cylinder valve, the valve assembly 1 for the filling gun is used for being communicated with an external air source, and a to-be-filled gas is filled into a cylinder through the valve assembly 1 for the filling gun, the inner gun tube 2, the gun head 4 and the cylinder valve, thereby completing filling of pressure gas.

As shown in fig. 2, the valve assembly 1 for filling gun comprises a wrench 13, a valve stem 12, a sealing ring 14, a sealing ring 15, a valve body 11, etc., wherein the wrench 13 is rotated to further rotate the valve stem 12 in the valve body 11, and the sealing ring 14 plays a sealing role between the valve stem 12 and the valve body 11 to prevent pressure gas from overflowing through a gap between the valve stem 12 and the valve body 11. The lower part of the valve rod 12 is an eccentric shaft which is connected with the ejector rod 7, and the ejector rod 7 reciprocates along with the rotation of the valve rod 12 in the inner barrel 2. The end of the mandril 7 is fixed with a sealing gasket 71 which is matched with a processing surface inside the gun head 4 and plays a role in sealing under the condition of closing the hand valve component 1 for filling the gun. When the hand valve component 1 for filling gun needs to be opened, the wrench 13 is rotated to drive the valve rod 12 to rotate, the valve rod 12 drives the ejector rod 7 and the sealing gasket 71 to move towards the direction of the valve rod 12 in the inner barrel 2 through the eccentric shaft, and then the channel of the gun head 4 is opened, so that the opening of the hand valve component 1 for filling gun is realized.

In the prior art, a gap between a valve rod 12 and a valve body 11 of a hand valve assembly 1 for a filling gun is sealed by a sealing ring 14 sleeved on the valve rod 12, and the valve rod 12 and the valve body 11 need to be in a sealing state all the time when the hand valve assembly 1 for the filling gun is opened and closed, so that the sealing ring 14 has a friction action with the valve body 11 when the hand valve assembly 1 for the filling gun is opened and closed, the sealing effect at the position is poor, the service life is limited under a pressure gas environment, and the sealing ring 14 needs to be replaced for several months basically.

In addition, the sealing members (such as the seal rings 14, 15, 21, and 71) used in the filling gun are all made of rubber-based elastomers, and have a short life and require regular maintenance and replacement.

Therefore, how to improve the reliability of the sealing and increase the life of the sealing element becomes a technical problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the present invention is directed to a hand valve assembly for a filling gun, so as to improve the reliability of sealing and prolong the service life of a sealing element;

it is another object of the present invention to provide a filling gun.

In order to achieve the purpose, the invention provides the following technical scheme:

a valve assembly for a filling gun, comprising:

the valve body is provided with a valve rod cavity, an air outlet channel and an air inlet channel;

the valve rod is movably arranged in the valve rod cavity so as to switch the on-off of the air outlet channel and the air inlet channel;

the static sealing element is used for sealing a gap between the valve body and the valve rod and at least comprises a corrugated pipe sleeved on the valve rod, one end of the corrugated pipe is in sealing connection with the valve rod, and the other end of the corrugated pipe is in sealing connection with the valve body.

Preferably, in the above valve assembly for a filling gun, the static seal further includes a first sealing gasket and a pressing member, the first sealing gasket is fixed on the valve body through the pressing member, and the bellows is in sealing connection with the pressing member, so as to be in sealing connection with the valve body through the pressing member and the first sealing gasket.

Preferably, in the above-described valve assembly for a filling gun, the pressing piece includes:

the flange is sleeved on the valve rod, is connected with the corrugated pipe in a sealing mode, and compresses the first sealing gasket;

the pressing cap is in threaded fit with the valve body;

and the pressing piece is arranged in the valve rod cavity, one end of the pressing piece is abutted to the pressing cap, and the other end of the pressing piece is abutted to the flange, so that the flange is pressed on the first sealing gasket.

Preferably, in the above valve assembly for a filling gun, the bellows is a metal bellows, and is hermetically connected to the valve stem and the flange by welding.

Preferably, in the above-mentioned hand valve assembly for filling gun, a first limit step is provided on an inner wall of the valve rod cavity, one side of the first seal gasket is positioned on the first limit step, and the other side of the first seal gasket abuts against the flange.

Preferably, in the above-mentioned valve assembly for a filling gun, the valve stem is connected with a wrench extending out of the pressing cap, the wrench is connected with the valve stem through a wrench rod, the wrench rod is in threaded connection with the pressing cap, and the wrench is screwed to drive the valve stem to move along the valve stem cavity.

Preferably, in the above-mentioned hand valve assembly for filling gun, an installation caulking groove is opened at an end portion of the valve rod close to one end of the air outlet channel, a second sealing gasket is arranged in the installation caulking groove, and the second sealing gasket is abutted against and separated from the valve body so as to switch the on-off of the air outlet channel and the air inlet channel.

Preferably, in the above hand valve assembly for a filling gun, the air outlet channel and the air inlet channel are both communicated with the valve rod cavity, and the second sealing gasket is abutted against and separated from the valve body so as to switch on and off of one of the air outlet channel and the air inlet channel and the valve rod cavity.

Preferably, in the above-described valve assembly for a filling gun, a sealing surface extending into the valve rod chamber is formed on an outer wall of the air outlet passage, and the second gasket is adapted to be brought into contact with and separated from the sealing surface to switch the opening and closing of the air outlet passage and the valve rod chamber.

Preferably, in the above-mentioned valve assembly for a filling gun, the air inlet passage is provided with an internal threaded hole which penetrates through an end portion of the valve body and is used for connecting with an internal gun tube.

Preferably, in the above-mentioned valve assembly for a filling gun, one end of the internal threaded hole close to the air inlet channel is provided with a stop step, and a third sealing gasket is arranged at the stop step.

Preferably, in the above valve assembly for a filling gun, the first gasket, the second gasket, and the third gasket are all corrosion-resistant and pressure-resistant gaskets.

Preferably, in the above valve assembly for a filling gun, the first gasket, the second gasket, and the third gasket are teflon gaskets or nylon gaskets.

A filling gun comprises a gun body, an inner gun tube and a filling gun hand valve assembly communicated with the inner gun tube, wherein the filling gun hand valve assembly is the filling gun hand valve assembly.

Preferably, in the above filling gun, an air inlet channel of the valve assembly for the filling gun is communicated with the inner gun tube, and a gun head opposite to the gun body is formed at the air outlet channel.

Preferably, in the filling gun, the gun head is covered with a rubber elastic gun head cup.

The hand valve assembly for filling gun provided by the invention is different from the prior art in that the sealing between the valve body and the valve rod is realized by the static sealing element. Wherein, the bellows respectively with valve rod and valve body sealing connection, utilize the flexible characteristic of bellows for when the valve rod removed, the sealing connection department of bellows and valve rod and valve body need not produce relative displacement, consequently improves sealed reliability more easily.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a prior art filling gun;

FIG. 2 is a cross-sectional view of a prior art inflation assembly of the filling gun;

FIG. 3 is a schematic structural view of a filling gun according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a fill gun hand valve assembly provided by an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a valve body of a hand valve assembly for a filling gun provided in accordance with an embodiment of the present invention;

FIG. 6 is a cross-sectional view of the mating of a static seal and a valve stem provided by an embodiment of the present invention;

fig. 7 is a cross-sectional view of a filling gun provided in an embodiment of the present invention.

Wherein, 1 is a valve component for filling a gun, 2 is an inner gun barrel, 3 is a gun body, 4 is a gun head, 5 is a gun main body, 6 is a gun handle, 7 is an ejector rod, 11 is a valve body, 12 is a valve rod, 13 is a wrench, 14 is a sealing ring, 15 is a sealing ring, 21 is a sealing ring, and 71 is a sealing gasket;

the automatic sealing device comprises a valve assembly for filling a gun, 20 an inner barrel, 30 a gun body, 40 a gun handle, 50 a gun body, 101 a wrench rod, 102 a wrench, 103 a pressing cap, 104 a pressing ring, 105 a pressing plate, 106 a first sealing gasket, 107 a second sealing gasket, 108 a flange, 109 a corrugated pipe, 110 a valve body, 111 a gun head, 112 a third sealing gasket, 113 an air inlet channel, 114 an internal threaded hole, 115 an air outlet channel, 116 a stop step, 117 a sealing surface, 118 a valve rod cavity, 119 a first limit step, 120 a valve rod, 121 a gun head cup, 1151 a first branch channel and 1152 a second branch channel.

Detailed Description

The core of the invention is to provide a hand valve assembly for a filling gun, so as to improve the sealing reliability and prolong the service life of a sealing element.

Another core of the present invention is to provide a filling gun having the above-described hand valve assembly for a filling gun.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.

In order to solve the problems of poor sealing reliability and short service life caused by the fact that dynamic sealing is adopted between a valve body and a valve rod, the inventor adopts a skillful conception to overcome the technical problem that only dynamic sealing can be adopted between two opposite moving parts in the technical field, and discloses a technical scheme for realizing sealing between the two opposite moving parts by adopting a static sealing structure.

As shown in fig. 4, an embodiment of the present invention discloses a hand valve assembly for a filling gun, which includes a valve body 110, a valve stem 120, and a static seal for sealing a gap between the valve body 110 and the valve stem 120 to prevent high-pressure gas from escaping through the gap.

Referring to fig. 5, the valve body 110 has a stem cavity 118, an outlet passage 115, and an inlet passage 113, and the stem cavity 118, the outlet passage 115, and the inlet passage 113 are in communication with each other so that pressure gas can be discharged through the inlet passage 113 and the outlet passage 115.

As shown in fig. 4, a valve stem 120 is movably disposed in the valve stem cavity 118 to switch the outlet passage 115 and the inlet passage 113. The communicating state of outlet passage 115 and inlet passage 113 is shut off or outlet passage 115 and inlet passage 113 are switched from the shut-off state to the communicating state by linear movement of valve stem 120 in valve stem cavity 118. In an embodiment of the present invention, taking the spatial position relationship of the hand valve assembly for the filling gun as shown in fig. 4 as an example, the valve rod 120 moves downward along the valve rod cavity 118 to block the communication relationship between the air outlet channel 115 and the air inlet channel 113, and the valve rod 120 moves upward along the valve rod cavity 118 to switch the air outlet channel 115 and the air inlet channel 113 from the blocked state to the communication state.

The static sealing element at least comprises a bellows 109 sleeved on the valve stem 120, one end of the bellows 109 is connected with the valve stem 120 in a sealing way, and the other end is connected with the valve body 110 in a sealing way. It will be appreciated by those skilled in the art that the bellows 109 is a tube with corrugated outer walls, which can be compressed and stretched in the axial direction by an external force due to its particular structure.

Taking the spatial position relationship of the hand valve assembly for the filling gun shown in fig. 4 as an example, when filling with pressure gas is required, the valve rod 120 is controlled to move upwards along the valve rod cavity 118, the lower part of the bellows 109 moves upwards along with the valve rod 120 because the upper part of the bellows 109 is fixed relative to the valve body 110, and the upper part of the bellows 109 is fixed relative to the valve body 110, so that the bellows 109 compresses upwards, the gas outlet channel 115 and the gas inlet channel 113 are switched from the blocking state to the communicating state, and the pressure gas enters from the gas inlet channel 113 and fills the gas cylinder through the gas outlet channel 115.

After the pressurized gas is filled, the valve rod 120 is controlled to move downwards along the valve rod cavity 118, the lower part of the corrugated pipe 109 moves downwards along with the valve rod 120, while the upper part of the corrugated pipe 109 is fixed relative to the valve body 110, so that the corrugated pipe 109 stretches downwards, and the gas outlet channel 115 and the gas inlet channel 113 are switched from a communication state to a cut-off state to cut off the passage of the pressurized gas.

The present invention provides a hand valve assembly for a filling gun, which is different from the prior art in that the sealing between the valve body 110 and the valve stem 120 is realized by a static sealing member. The bellows 109 is connected to the valve stem 120 and the pressing member in a sealing manner, and the bellows 109 does not need to be displaced relative to the sealing connection between the valve stem 120 and the valve body 110 when the valve stem 120 moves due to the expansion and contraction characteristics of the bellows 109, thereby improving the sealing reliability.

In an embodiment of the present invention, the static sealing element further includes a first sealing gasket 106 and a pressing member, the first sealing gasket 106 is fixed on the valve body 110 by the pressing member, and the bellows 109 is sleeved on the valve stem 120 and is respectively connected to the valve stem 120 and the pressing member in a sealing manner, so that the bellows 109 is connected to the valve body 110 in a sealing manner by the pressing member and the first sealing gasket 106. The present solution utilizes the expansion characteristic of the bellows 109, so that when the valve rod 120 moves along the valve rod cavity 118, the bellows 109 can achieve adaptive expansion, thereby ensuring the sealing connection relationship between the bellows 109 and the valve rod 120 and the sealing connection relationship between the bellows 109 and the pressing member, and not changing. Because the pressing piece and the first sealing gasket 106 are fixed relative to the valve body 110, the first sealing gasket 106 has higher sealing reliability relative to dynamic sealing, and the service life of the sealing element is prolonged.

Taking the spatial position relationship of the hand valve assembly for filling gun shown in fig. 4 as an example, when filling pressure gas is required, the valve rod 120 is controlled to move upwards along the valve rod cavity 118, the lower part of the bellows 109 moves upwards along the valve rod 120 because the pressing piece is fixed relative to the valve body 110, while the upper part of the bellows 109 is fixed relative to the pressing piece, so that the bellows 109 compresses upwards, the gas outlet channel 115 and the gas inlet channel 113 are switched from the blocking state to the communicating state, and the pressure gas enters from the gas inlet channel 113 and fills the gas cylinder through the gas outlet channel 115.

After the pressurized gas is filled, the valve rod 120 is controlled to move downwards along the valve rod cavity 118, the pressing piece is fixed relative to the valve body 110, so that the lower part of the corrugated pipe 109 moves downwards along with the valve rod 120, and the upper part of the corrugated pipe 109 is fixed relative to the pressing piece, so that the corrugated pipe 109 stretches downwards, and the gas outlet channel 115 and the gas inlet channel 113 are switched from the communication state to the cut-off state to cut off the passage of the pressurized gas.

In a specific embodiment of the present invention, the pressing member includes a flange 108, a pressing cap 103, and a pressing member. The flange 108 is sleeved on the valve stem 120 and is connected with the bellows 109 in a sealing manner. When the corrugated tube 109 is a metal corrugated tube (for example, a stainless steel corrugated tube), an end of the corrugated tube 109 may be welded to one side end face of the flange 108, or a flange structure integrally formed with the corrugated tube 109 may be directly formed at the end of the corrugated tube 109, as long as relative fixation between the two is ensured, and meanwhile, a sealing is ensured at a connection position. The flange 108 compresses the first gasket 106 to prevent pressurized gas from escaping through the gap between the flange 108 and the first gasket 106.

The press cap 103 is threadedly engaged with the valve body 110 for providing a preload force to the engagement of the flange 108 and the first gasket 106 by threadedly engaging with the valve body 110. Since the pressing cap 103 needs to be disposed at the end of the valve body 110 and the flange 108 is located inside the stem cavity 118 with a certain distance therebetween, a pressing member is added in order to ensure the transmission of the preload force to the flange 108. The pressing member is disposed in the valve stem cavity 118, and one end of the pressing member abuts against the pressing cap 103, and the other end of the pressing member abuts against the flange 108, so as to press the flange 108 against the first gasket 106.

It should be noted that the pressing member may be integrated with the pressing cap 103, and a separate component is not required. The compression member may also be provided as two parts: the pressure ring 104 is arranged between the pressure plate 105 and the pressure cap 103, and the pretightening force of the pressure cap 103 is transmitted to the flange 108 through the pressure ring 104 and the pressure plate 105. The pressing plate 105 is a plate-shaped structure with a small thickness and a large difference between the inner diameter and the outer diameter; the press ring 104 is a cylindrical structure with a high height and a small difference between the inner diameter and the outer diameter. The pressure plate 105 is provided to ensure uniform transfer of the pretension to the flange 108, while the pressure ring 104 is provided at a higher height to connect the pressure cap 103 and the pressure plate 105.

In one embodiment of the present invention, as shown in fig. 6, the bellows 109 is a metal bellows and is sealingly connected to the valve stem 120 and the flange 108 by welding. The metal bellows has good elasticity, can be elastically deformed within a certain range, can stretch and contract in the stem cavity 118 of the valve body 110, and can resist the pressure of fluid to a certain degree in the circumferential direction, so that the dynamic seal in the prior art is converted into a reliable and easily controlled static seal. It should be noted that the bellows 109 may also be made of other materials, as long as it has certain elasticity, and can achieve both stretching and contracting functions. The bellows 109 can be connected with the valve rod 120 and the flange 108 in a sealing manner by bonding, or the bellows 109 and the valve rod 120 and the flange 108 are designed into an integrated structure, so that the sealing connection between the bellows and the valve rod can be realized, namely, the relative fixation is completed, and meanwhile, the air tightness of the joint is ensured, and the leakage of pressure gas is avoided.

As shown in fig. 5, a first limit step 119 is disposed on an inner wall of the valve rod cavity 118, one side of the first sealing gasket 106 is positioned on the first limit step 119, and the other side of the first sealing gasket 106 abuts against the flange 108, i.e., the first sealing gasket 106 is positioned by the first limit step 119 and the flange 108, so as to ensure relative fixation with the valve body 110.

In order to realize the up-and-down movement of the valve stem 120 along the valve stem cavity 118, the valve stem 120 is connected with a wrench 102 extending out of the pressing cap 103, the wrench 102 is connected with the valve stem 120 through a wrench stem 101, the wrench stem 101 is in threaded connection with the pressing cap 103, the wrench 102 is rotated to drive the valve stem 120 to move along the valve stem cavity 118, the wrench stem 101 is rotated by rotating the wrench 102, because the wrench stem 101 is in threaded connection with the pressing cap 103, the up-and-down movement can be completed while the wrench stem 101 rotates, the wrench stem 101 is hinged with the valve stem 120, so that the valve stem 120 is driven to move along the valve stem cavity 118, and the switching between the communicating state and the blocking state of the air outlet channel 115 and the air inlet channel 113 is completed.

As shown in fig. 6, an installation caulking groove is formed at an end portion of the valve rod 120 close to one end of the air outlet channel 115, a second sealing gasket 107 is arranged in the installation caulking groove, and the second sealing gasket 107 abuts against and is separated from the valve body 110 to switch on and off of the air outlet channel 115 and the air inlet channel 113. The second gasket 107 may be fixed in the mounting caulking groove by an adhesive or an interference fit, and plays a role in sealing the valve.

As shown in fig. 5, both the outlet passage 115 and the inlet passage 113 communicate with the stem chamber 118, and the second gasket 107 is brought into and out of abutment with the valve body 110 to switch on and off one of the outlet passage 115 and the inlet passage 113 with the stem chamber 118. In this embodiment, the second gasket 107 abuts against the valve body 110, so that the communication between the air outlet channel 115 and the valve rod cavity 118 can be cut off, and then the pressure gas can not enter the air outlet channel 115 after entering the valve rod cavity 118 from the air inlet channel 113, and can not be discharged through the air outlet channel 115, thereby achieving the channel cutting function. It should be noted that the connection between the air inlet channel 113 and the valve rod cavity 118 may also be cut off by the abutment of the second gasket 107 and the valve body 110, so that the pressure gas cannot enter the valve rod cavity 118 from the air inlet channel 113, and also cannot enter the air outlet channel 115, and is discharged through the air outlet channel 115, thereby achieving the channel cutting function.

With continued reference to fig. 5, the outer wall of the outlet passage 115 is formed with a sealing surface 117 extending into the stem cavity 118, and the second gasket 107 is adapted to abut against and separate from the sealing surface 117 to switch the outlet passage 115 and the stem cavity 118. In this embodiment, the addition of the sealing surface 117 extending into the stem cavity 118 facilitates the abutment of the second gasket 107 with the valve body 110, and further facilitates sealing.

The outlet channel 115 may be composed of two branch channels at a certain angle, the two branch channels are a first branch channel 1151 and a second branch channel 1152, in the embodiment shown in fig. 5, the first branch channel 1151 and the second branch channel 1152 are perpendicular to each other, so as to facilitate the processing, and it is known to those skilled in the art that the first branch channel 1151 and the second branch channel 1152 may be processed at any angle, including an angle of 0 ° therebetween, according to the actual requirement. The second branch channel 1152 is used for communicating with the valve rod cavity 118, and the sealing surface 117 is formed by extending the outer wall of the second branch channel 1152 into the valve rod cavity 118. The outlet channel 115 is designed as two branch channels at an angle to each other because the axial direction of the valve rod cavity 118 is perpendicular to the axial direction of the first branch channel 1151, so that a second branch channel 1152 is required to be added to connect the axial direction of the valve rod cavity 118 with the first branch channel 1151, and to make the second branch channel 1152 parallel to the axial direction of the valve rod cavity 118, so as to facilitate the sealing abutment of the second gasket 107 with the sealing surface 117 when the valve rod 120 moves down along the valve rod cavity 118 to block the communication relationship between the outlet channel 115 and the inlet channel 113.

As shown in fig. 5, an air inlet 113 is opened with an internal threaded hole 114 penetrating the end of the valve body 110 for connection with the inner gun tube 20. One end of the internal thread hole 114 close to the air inlet channel 113 is provided with a stop step 116, and the stop step 116 is provided with a third sealing gasket 112. Pressurized gas is fed through the inner barrel 20 into the fill gun hand valve assembly and is injected into the gas cylinder through the fill gun hand valve assembly.

In an embodiment of the present invention, the first gasket 106, the second gasket 107, and the third gasket 112 are all corrosion-resistant and pressure-resistant gaskets, which solves the problems of short service life and need of regular maintenance and replacement caused by using rubber-like elastic members in the prior art.

Further, the first gasket 106, the second gasket 107, and the third gasket 112 are teflon gaskets or nylon gaskets. Specifically, which material is selected can be selected according to different filling media, and the filling media can be ensured not to corrode the material.

As shown in fig. 3 and 7, the embodiment of the present invention also discloses a filling gun, which comprises a gun body 50, an inner gun tube 20 and a hand valve assembly 10 for the filling gun, which is communicated with the inner gun tube 20. The valve assembly 10 for filling gun is the valve assembly for filling gun disclosed in the above embodiments, and the structure is the same, so that the detailed description is omitted here. Since the filling gun disclosed in the embodiment of the present invention has the valve assembly 10 for filling gun, all technical effects of the valve assembly 10 for filling gun are achieved, and are not described herein again.

Further, an air inlet channel 113 of the hand valve assembly for filling the gun is communicated with the inner gun tube 20, and an air outlet channel 115 is formed at the gun head 111 opposite to the gun body 50 to facilitate connection with a gas cylinder valve.

Further, the tip 111 may be covered with a rubber elastic tip cup 121 to increase the sealing performance with the cylinder valve.

The filling gun disclosed by the embodiment of the invention clamps the gas cylinder valve through the hand valve component 10 for the filling gun and the gun main body 50, so that the hand valve component 10 for the filling gun is communicated with the gas cylinder valve, the inner gun tube 20 is used for being communicated with an external gas source, and pressure gas is filled into the gas cylinder through the inner gun tube 20, the hand valve component 10 for the filling gun and the gas cylinder valve, thereby completing the filling of the pressure gas.

The terms "first" and "second," and the like in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include steps or elements not listed.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.